Technical visit to the Hong Kong section of the Guangzhou–Shenzhen–Hong Kong Express Rail Link (XRL) Contract 825 – Mai Po to Ngau Tam Mei Tunnels
Organised by the IOM3 Hong Kong Branch, visit to the XRL Contract 825 – Mai Po to Ngau Tam Mei Tunnels was held on 29 November 2014 with the participation of 19 persons.
Before the visit commenced, a presentation of the project background was given to the participants by Mr Eric Lee (Engineering Manager) and Mr Sakamoto (Construction Manager (Tunnel)) from the Contractor of XRL Contract 825, Penta-Ocean Construction Co. Ltd. (POC). The 26-km Hong Kong section of the Guangzhou–Shenzhen–Hong Kong Express Rail Link runs from the terminus in West Kowloon to Shenzhen. The XRL tunnels are being built in underground dedicated railway tunnels. The XRL would be part of the National High-speed Rail Network, targeting to run at a design speed of over 200 km/hr, connecting to other major cities in the Mainland. The XRL tunnels are constructed by tunnel boring or by drill and blast methods, while the terminus as well as some facilities will be constructed by cut-and-cover method.
The tunnel section under XRL Contract 825 - Mai Po to Ngau Tam Mei Tunnels is a twin tunnel in approximate 2.35 km long built by Tunnel Boring Machine (TBM). The works to be executed under this Contract includes the following major items:
- The southbound and northbound tunnels from Mai Po ventilation building to the Ngau Tam Mei ventilation building carried out by TBM;
- Cross-passages between the two tunnels;
- The Mai Po ventilation building and associated ventilation shaft, including ABWF Works;
- Site formation at the Mai Po ventilation building site;
- External works including access roads, landscaping and utility services at the Mai Po ventilation building.
Currently constructions of both Southbound and Northbound Tunnels as well as the Mai Po Ventilation Building have been substantially completed. Remaining items include cross passages between tunnels, site formation and external works in vicinity of the Ventilation Building etc.
Through this visit, participants had a better understanding of the TBM tunneling works and the challenges in construction of cross passages between bored tunnels.
On behalf of the IOM3 HK Branch, we would like to express our sincere thanks to Mr Eric Lee of POC for the kind arrangements of the site visit.